Laserfiche WebLink
SUM <br /> Harding Lawson Associates <br /> Furthermore, only very low concentrations of TPH, toluene, and/or <br /> xylenes were found in water from MW-1 and MW-2 during the July <br /> - 1991 sampling event. As shown in Table 5, the detectable <br /> concentrations of toluene and xylenes in the July 1991 water <br /> T samples were well below the Maximum Contaminant Levels (MCLs) <br /> and/or Drinking Water Action Levels (DWAL's) , specified by the <br /> State Department of Health Services. Concentrations of all <br /> compounds tested for in water samples from the wells in August <br /> and September, 1991 were non-detectable. No benzene was detected <br /> in any of the soil or water samples tested during HLA's <br /> investigation. On the basis of these results, HLA concludes that <br /> the very low concentrations of petroleum hydrocarbons found in <br /> the soil and in the first round of water sampling are of limited <br /> significance, and that the potential degradation of water quality <br /> u above DWAL's and due to these compounds is highly improbable. <br /> The results of our study do not indicate the source of the <br /> very low levels of petroleum hydrocarbons found on site. They <br /> may be related to either the small release from the Cozad tank or <br /> possibly the petroleum release from nearby sites such as the <br /> Paragon Venture site. The absence of petroleum hydrocarbon odor <br /> and the low PID readings of the soil samples correlate with the <br /> chemical test results on soil samples that show an absence of all <br /> contaminants analyzed for with the exception of toluene. <br /> z <br /> 12 . <br />